gtk+: Add gtk-demo files and fix typo in binary name
gtk+: Add gtk-demo files and fix typo in binary name

superdump/cerbero,EricssonResearch/cerbero,ford-prefect/cerbero,jackjansen/cerbero,justinjoy/cerbero,AlertMe/cerbero,ramaxlo/cerbero,ramaxlo/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,fluendo/cerbero,nirbheek/cerbero,lubosz/cerbero,brion/cerbero,centricular/cerbero,ramaxlo/cerbero,AlertMe/cerbero,cee1/cerbero-mac,GStreamer/cerbero,ramaxlo/cerbero,ylatuya/cerbero,nirbheek/cerbero,nirbheek/cerbero,sdroege/cerbero,ikonst/cerbero,superdump/cerbero,BigBrother-International/gst-cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,flexVDI/cerbero,BigBrother-International/gst-cerbero,cee1/cerbero-mac,AlertMe/cerbero,EricssonResearch/cerbero,nicolewu/cerbero,flexVDI/cerbero,GStreamer/cerbero,centricular/cerbero,AlertMe/cerbero,ford-prefect/cerbero,EricssonResearch/cerbero,shoreflyer/cerbero,superdump/cerbero,nzjrs/cerbero,EricssonResearch/cerbero,lubosz/cerbero,OptoFidelity/cerbero,brion/cerbero,atsushieno/cerbero,shoreflyer/cerbero,nzjrs/cerbero,multipath-rtp/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,multipath-rtp/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,nirbheek/cerbero-old,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,OptoFidelity/cerbero,EricssonResearch/cerbero,flexVDI/cerbero,ramaxlo/cerbero,nicolewu/cerbero,lubosz/cerbero,ikonst/cerbero,ikonst/cerbero,GStreamer/cerbero,jackjansen/cerbero,jackjansen/cerbero,davibe/cerbero,sdroege/cerbero,jackjansen/cerbero-2013,nzjrs/cerbero,flexVDI/cerbero,justinjoy/cerbero,GStreamer/cerbero,atsushieno/cerbero,brion/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,multipath-rtp/cerbero,atsushieno/cerbero,BigBrother-International/gst-cerbero,lubosz/cerbero,cee1/cerbero-mac,jackjansen/cerbero-2013,superdump/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,multipath-rtp/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,GStreamer/cerbero,sdroege/cerbero,jackjansen/cerbero-2013,atsushieno/cerbero,multipath-rtp/cerbero,AlertMe/cerbero,fluendo/cerbero,centricular/cerbero,nzjrs/cerbero,davibe/cerbero,OptoFidelity/cerbero,ylatuya/cerbero,shoreflyer/cerbero,ikonst/cerbero,atsushieno/cerbero,justinjoy/cerbero,BigBrother-International/gst-cerbero,flexVDI/cerbero,nirbheek/cerbero-old,ylatuya/cerbero,fluendo/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,ford-prefect/cerbero,fluendo/cerbero,BigBrother-International/gst-cerbero,nirbheek/cerbero,davibe/cerbero,OptoFidelity/cerbero,nirbheek/cerbero-old,jackjansen/cerbero-2013,brion/cerbero,shoreflyer/cerbero,sdroege/cerbero,centricular/cerbero,ylatuya/cerbero,shoreflyer/cerbero,ford-prefect/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,nirbheek/cerbero-old,cee1/cerbero-mac,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,jackjansen/cerbero,centricular/cerbero,ikonst/cerbero,fluendo/cerbero,nzjrs/cerbero,jackjansen/cerbero-2013,nicolewu/cerbero,sdroege/cerbero,davibe/cerbero,brion/cerbero,justinjoy/cerbero